Source : Webster's Revised Unabridged Dictionary (1913)

Sideling \Side"ling\, adv. [OE. sideling, fr. side side. See
   {Side}, and cf. {Sidelong}, {Headlong}.]
   Sidelong; on the side; laterally; also, obliquely; askew.

         A fellow nailed up maps . . . some sideling, and others
         upside down.                             --Swift.

Sideling \Side"ling\, a.
   Inclining to one side; directed toward one side; sloping;
   inclined; as, sideling ground.